Question: Which of the following equations is balanced?

Answer: 2Na + Cl2 —— 2NaCl

Question: Why must chemical equations be balanced?

Answer: to represent conservation of mass

Question: balanced equation for P + O2 ——- P2O5

Answer: 4P + 5O2 —— 2P2O5

Question: balanced equation for CA + O2 —— CaO

Answer: 2Ca + O2 —— 2CaO

Question: The equation 2NaNO3 + CaCl2 ——- Ca(NO3)2 is balanced. How many oxygen atoms are on each side?

Answer: 6

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